Dell PowerVault MD3600i Deployment Manual
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Dell PowerVault MD3600i Deployment Manual

Storage arrays
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See also: Owner's Manual , Configuration Manual
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  • Page 1 Dell PowerVault MD3600i and MD3620i Storage Arrays Deployment Guide...
  • Page 2 © 2010 Dell Inc. All rights reserved. Reproduction of these materials in any manner whatsoever without the written permission of Dell Inc. is strictly forbidden. Trademarks used in this text: Dell™, the DELL logo, and PowerVault™ are trademarks of Dell Inc. ® ®...

  • Page 3: Table Of Contents

    Contents Introduction ......System Requirements ....Management Station Requirements .
  • Page 4 Graphical Installation (Recommended) ..Console Installation ....Silent Installation ....Post Installation Tasks .
  • Page 5 Default Management IPv4 Port Settings ..Automatic Storage Array Discovery ..Manual Storage Array Discovery ..Setting Up the Array .
  • Page 6 B Appendix—Using Internet Storage Naming Service ....C Appendix—Load Balancing ..Load Balance Policy .

  • Page 7: Introduction

    Before installing and configuring the MD3600i Series hardware and software, ensure that the minimum system requirements are met, and the supported operating system is installed. For more information, see the Dell PowerVault Support Matrix available on support.dell.com/manuals. Management Station Requirements...

  • Page 8: Introduction To Storage Arrays

    Enterprise Server. Operating system installations can be either native or hypervisor guest configurations. Supported hypervisors include Microsoft Hyper-V, Citrix XenServer, and VMware. For information about the supported versions, see the Support Matrix at support.dell.com. • Administrator or equivalent permissions. Introduction to Storage Arrays A storage array includes various hardware components, such as physical disks, RAID controller modules, fans, and power supplies, gathered into enclosures.
  • Page 9 You can set a specified RAID level for each disk group and virtual disk on your storage array. For more information about using RAID and managing data in your storage solution, see the Owner’s Manual at support.dell.com/manuals. Introduction...
  • Page 10 Introduction...

  • Page 11: Hardware Installation

    • Planning section of the Owner’s Manual—The planning section provides information about important concepts you should know before setting up your storage solution at support.dell.com/manuals. Storage Configuration Planning Consider the following before installing your storage array: • Evaluate data storage needs and administrative requirements.

  • Page 12: About The Storage Array Connections

    PowerVault MD1200 Series expansion enclosures for additional storage capacity. Each PowerVault MD3600i Series storage array can be expanded to a maximum of 96 physical disks through a maximum of seven MD1200 Series expansion enclosures.

  • Page 13: Direct-Attached Configurations

    Direct-Attached Configurations You can connect the Ethernet ports of the host servers directly to the storage array RAID controller module iSCSI ports. Single Path Data Configurations With a single path configuration, a group of heterogeneous hosts can be connected to the storage array through a single physical Ethernet port. Since there is only one port, there is no redundancy, although each iSCSI portal supports multiple connections.
  • Page 14 Figure 2-1 shows a non-redundant cabling configuration to the RAID controller modules using a single path data configuration. Figure 2-1. Two Hosts Connected to a Single Controller Server 1 Server 2 Storage array Corporate, public, or private network Hardware Installation...
  • Page 15 Figure 2-2 shows one host connected to a single controller array. Figure 2-2. One Host Connected to a Single Controller Server Storage array Corporate, public, or private network Hardware Installation...
  • Page 16 Figure 2-3 shows four stand-alone hosts supported in a dual controller array configuration with a single data path. Figure 2-3. Four Hosts in a Dual-Controller Configuration Server 1 Server 2 Server 3 Server 4 Storage array Corporate, public, or private network Hardware Installation...
  • Page 17 Dual-Path Data Configuration In Figure 2-4, up to two servers are directly attached to the RAID controller modules. If the host server has a second Ethernet connection to the array, it can be attached to the iSCSI ports on the array's second controller. This configuration provides improved availability by allowing two separate physical paths for each host, which ensures full redundancy if one of the paths fail.
  • Page 18 Figure 2-4. Two Hosts Connected to Two Controllers Server 1 Server 2 Storage array Corporate, public, or private network Hardware Installation...
  • Page 19 Figure 2-5. Two Hosts Connected in a Dual-Controller Configuration Two node cluster server Storage array Corporate, public, or private network Hardware Installation...

  • Page 20: Network-Attached Configurations

    10G or 1G Ethernet switches. An iSCSI configuration that uses Ethernet switches is frequently referred to as an IP SAN. By using an IP SAN, the PowerVault MD3600i Series storage array can support up to 64 hosts simultaneously. This configuration supports either single- or dual-path data configurations and either single or dual controller modules.
  • Page 21 Figure 2-6. 64 Servers Connected to a Single Controller Up to 64 hosts Switch Storage array Corporate, public, or private network Hardware Installation...
  • Page 22 Figure 2-7. 64 Servers Connected to Two Controllers Up to 64 hosts Storage array Corporate, public, or private network Hardware Installation...
  • Page 23 Figure 2-8. 64 Servers Connected to a Single RAID Controller Up to 64 hosts 1G NICs 1G Switches 10G Uplinks 10G Switch Storage array Hardware Installation...
  • Page 24 Figure 2-9. 64 Servers Connected to Two RAID Controllers Up to 64 hosts 1G NICs 1G Switches 10G Uplinks 10G Switches Hardware Installation...

  • Page 25: Cabling Powervault Md1200 Series Expansion Enclosures

    Cabling PowerVault MD1200 Series Expansion Enclosures You can expand the capacity of your PowerVault MD3600i Series storage array by adding PowerVault MD1200 Series expansion enclosures. You can expand the physical disk pool to a maximum of 96 physical disks using a maximum of seven expansion enclosures.
  • Page 26 MD3600i Series resource media. For information about installing the software, see "Software Installation" on page 29. Using MDSM, update the RAID controller module firmware and NVSRAM to the latest versions available at support.dell.com. In the Enterprise Management Window (EMW), Click Tools Upgrade RAID Controller Module Firmware.

  • Page 27: Expanding With New Powervault Md1200 Series Expansion Enclosures

    Expanding With New PowerVault MD1200 Series Expansion Enclosures Perform the following steps to attach new PowerVault MD1200 Series expansion enclosures to a PowerVault MD3600i Series storage array: 1 Before adding the expansion enclosure(s), ensure that the storage array software is installed and up to date. For more information, see the Support Matrix at support.dell.com/manuals.
  • Page 28 5 Using MDSM, update all attached expansion enclosure firmware if it is out of date: From the EMW, select the enclosure that you want to update and enter the Array Management Window (AMW). Click Advanced Maintenance DownloadEMM Firmware. Select Select All to update all the attached expansion enclosures simultaneously.

  • Page 29: Software Installation

    Software Installation The Dell PowerVault MD3600i Series resource media contains software and drivers for both Linux and Microsoft Windows operating systems. The root of the media contains a readme.txt file covering changes to the software, updates, fixes, patches, and other important data applicable to both Linux and Windows operating systems.

  • Page 30: Graphical Installation (Recommended)

    (192.168.128.101 or 192.168.128.102). After initial configuration, the management ports are configured using MDSM and the management station’s IP address can be changed back to the previous settings. The PowerVault MD3600i Series resource media provided offers the following three installation methods: •...
  • Page 31 5 Launch the MDCU if it does not appear automatically after rebooting the host server. To launch the MDCU: • In a Windows-based operating system, click Start Dell Modular Disk Configuration Utility. In a Linux-based operating system, double-click the Modular Disk •...

  • Page 32: Console Installation

    Console Installation NOTE: Console installation only applies to Linux systems that are not running a graphical environment. The autorun script in the root of the resource media detects when there is no graphical environment running and automatically starts the installer in a text-based mode.
  • Page 33 To run silent installation in a Linux system, perform the following steps: 1 To begin the installation with all the default options, navigate to the linux folder on the resource media and run the following command: ./md36xxi_install.bin –i silent 2 To specify which features are to be installed silently, you must modify the custom_silent.properties file located in the same directory and copy it to a writable location on the host server.
  • Page 34 Software Installation...

  • Page 35: Post Installation Tasks

    Post Installation Tasks Before using the storage array for the first time, complete a number of initial configuration tasks in the order shown. These tasks are performed using the MD Storage Manager (MDSM) or, optionally, the Modular Disk Configuration Utility (MDCU) software. NOTE: If Dynamic Host Configuration Protocol (DHCP) is not used, perform the initial configuration using the management station on the same physical subnet as the storage...

  • Page 36: Iscsi Configuration Worksheet

    Table 4-1. Standard Terminology Used in iSCSI Configuration Term Definition iSCSI initiator The iSCSI-specific software installed on the host server that controls communications between the host server and the storage array. iSCSI host port The iSCSI port (two per controller) on the storage array.

  • Page 37: Ipv4 Settings

    IPv4 Settings host server Mutual CHAP Secret 192.168.128.101 (management network port) 192.168.131.101 (In 1 default) Target CHAP 192.168.130.101 (In 0 default) PowerVault Secret MD36x0i 192.168.130.102 (In 0 default) 192.168.128.102 (management network port) 192.168.131.102 (In 1 default) If you need additional space for more than one host server, use an additional sheet. Subnet Static IP address (host server) Default gateway...

  • Page 38: Ipv6 Settings

    IPv6 Settings host server Mutual CHAP Target CHAP PowerVault MD36x0i If you need additional space for more than one host server, use an additional sheet. Host iSCSI port 1 Host iSCSI port 2 ___ . ___ . ___ . ___ ___ .

  • Page 39: Guidelines For Configuring Nics On Your Host Server

    iSCSI controller 1, In 0 FE80 : 0000 : 0000 : 0000 : ____ : ____ : ____ : ____ IP address ____ : ____ : ____ : ____ : ____ : ____ : ____ : ____ Routable IP address 1 ____ : ____ : ____ : ____ : ____ : ____ : ____ : ____ Routable IP address 2 ____ : ____ : ____ : ____ : ____ : ____ : ____ : ____...
  • Page 40 If you are using a DHCP server: 1 In the Control Panel, select Network connections or Network and Sharing Center and then click Manage network connections. 2 Right-click the network connection you want to configure and select Properties. 3 On the General tab (for a local area connection) or the Networking tab (for all other connections), select Internet Protocol (TCP/IP), and then click Properties.

  • Page 41: Linux Host Setup

    2 Right-click the network connection you want to configure and select Properties. 3 On the General tab (for a local area connection) or the Networking tab (for all other connections), select Internet Protocol (TCP/IP), and then click Properties. 4 Select Advanced WINS tab and click Add. 5 In the TCP/IP WINS server window, type the IP address of the WINS server and click Add.

  • Page 42: Configuring Iscsi On Your Storage Array

    2 Edit the configuration file for the connection you want to configure, either /etc/sysconfig/network-scripts/ifcfg-ethX (for Red Hat Enterprise Linux) or /etc/sysconfig/network/ifcfg-eth-id-XX:XX:XX:XX:XX (for SUSE Enterprise Linux). BOOTPROTO=dhcp Also, verify that an IP address and netmask are not defined. 3 Restart network services using the following command: /etc/init.d/network restart If you are using a static IP address (root users only):...

  • Page 43: Automatic Configuration Using The Modular Disk Configuration Utility

    Automatic Configuration Using the Modular Disk Configuration Utility NOTE: If MDCU is not installed, it can be installed from the MD3600i Series resource media. The MDCU provides a consolidated approach for configuring the iSCSI network of host servers and iSCSI-based storage arrays using a wizard-driven interface. This utility also enables the user to configure the iSCSI sessions of the host server according to the best practices and to achieve load-balanced paths with the storage array iSCSI host ports.
  • Page 44 5 Configure the IP protocols and addresses for the iSCSI ports. 6 Specify the CHAP authentication method. 7 Apply the settings after reviewing a summary. 8 Repeat the process starting from step 2 to configure additional arrays. Host Configuration (Host Connectivity Configuration) After you have completed configuring your iSCSI-based storage arrays, the next task is to run this utility on all hosts that need to access the storage arrays.
  • Page 45 1 Launch the utility (if it is not launched automatically) from the server with access to the management ports of the storage array(s) to be configured. For Windows, click StartAll ProgramsDellMD Storage SoftwareModular Disk Configuration Utility. For Linux, click the MDCU icon on the desktop or navigate to the /opt/dell/mdstoragesoftware/mdconfigurationutility directory in a terminal window and run MDCU.
  • Page 46 • Manual Discovery—Manual discovery allows you to locate iSCSI-based storage arrays that are outside of the local sub-network. Manual discovery requires selecting whether your storage array has a single controller (simplex) or dual controllers (duplex) and whether to use IPv4 or IPv6 protocol for communicating with the management port of the storage array.
  • Page 47 8 If you have selected Specify Configuration Manually for any of the two protocols in the last step, a series of screens showing the backend view image of the storage array controllers is displayed. Each image contains IP addresses of the management ports of the controllers. Also, each image has one management port highlighted in red.
  • Page 48 To use an IPv6 address for the highlighted port, enter the local IP address, routable IP, and router IP address in the fields shown below the image in order to modify it. Click Next to continue through these images to complete the configuration of all iSCSI ports for the selected protocols.
  • Page 49 See "Source Port Selection for iSCSI Host Ports" on page 51’ for more information about how these host IP addresses are listed in the drop-down menu and the recommended guidelines for selecting the host IP addresses. 18 Click Next to continue to enter the login information for another controller or Click Apply to save the login information.
  • Page 50 3 In the Discovery Method screen, select one of the following discovery methods: • If the host has access to the management ports of the MD storage array(s), then select Discover via Management Port method and click Next. • If the host does not have the access to the management ports of the array, then select the Discover via iSCSI Port method (assuming that the host has access to the iSCSI host ports of the storage array) and click Next.

  • Page 51: Contents

    Source Port Selection for iSCSI Host Ports In order to establish data communication between a host and an iSCSI-based storage array, the iSCSI initiator on the host must be configured to establish iSCSI sessions to the iSCSI host ports of the storage array. The iSCSI port login screen allows you to specify the host and storage array IP addresses the iSCSI initiator uses to establish these iSCSI sessions.

  • Page 52: Post Connection Establishment Steps

    To get detailed information regarding the first two tasks, refer to the Owner’s Manual, specifically, the sections entitled Creating Disk Groups and Virtual Disks and Host-to-Virtual Disk Mapping. The Owner’s Manual can be found at support.dell.com/manuals. For the final task, the source for your documentation will depend on your operating system.
  • Page 53 Configuration: Device Mapper Multipath for Linux chapter in the Owner’s Manual. – To utilize a graphical interface solution, Dell has created the Device Mapper Utility (DMU), which provides the ability to discover and manage the configuration of Linux Device Mapper devices for Dell Modular Disk series storage arrays.
  • Page 54 Post Installation Tasks...

  • Page 55: Uninstalling Software

    Software (MDSS) from Microsoft Windows operating systems other than Microsoft Windows Server 2008: 1 From the Control Panel, double-click Add or Remove Programs. 2 Select Dell MD36xxi Storage Software from the list of programs. 3 Click Change/Remove, and follow the instructions to complete the uninstallation process.

  • Page 56: Uninstalling From Linux

    2 From the installation directory, type the following command and press <Enter>: Uninstall Dell MD36xxi Storage Software 3 From the Uninstall window, click Next and follow the instructions on the screen. 4 Select Yes to restart the system, then click Done.

  • Page 57: A Appendix-Manual Configuration Of Iscsi

    Appendix—Manual Configuration of iSCSI The following sections contain step-by-step instructions for configuring iSCSI on your storage array. However, before beginning, it is important to understand where each of these steps occur in relation to your host server or the storage array environment. Table A-1 shows each iSCSI configuration step and where it occurs.

  • Page 58: Step 1: Discover The Storage Array (Out-Of-Band Management Only)

    Step 1: Discover the Storage Array (Out-of-band Management Only) Default Management IPv4 Port Settings By default, the storage array management ports are set to Dynamic Host Configuration Protocol (DHCP). If the controller(s) on your storage array is/are unable to get IP configuration from a DHCP server, it times out after 10 seconds and falls back to a default static IP address.

  • Page 59: Automatic Storage Array Discovery

    4 Finally, add the last three bytes of the MAC address FE80::0200:08FF:FEAA:BBCC. NOTE: This procedure applies to out-of-band management only. If you choose to set up in-band management, you must complete this step and then proceed to "Step 8: (Optional) Set Up In-Band Management" on page 76. You can discover the storage array either automatically or manually.

  • Page 60: Manual Storage Array Discovery

    Before configuring the storage array, check the status icons on the Summary tab to ensure that the enclosures in the storage array are in an Optimal status. For more information on the status icons, see the Owner’s Manual at support.dell.com/manuals. Appendix—Manual Configuration of iSCSI...

  • Page 61: Step 2: Configure The Iscsi Ports On The Storage Array

    Set up alert notifications To notify individuals (by e-mail) and/or storage enterprise management consoles, such as Dell Set up e-mail alerts Management Console, (by SNMP) when a Set up SNMP alerts storage array component degrades or fails, or an adverse environmental condition occurs.
  • Page 62 Controller 1, Port 2: IP: 192.168.132.102 Subnet Mask: 255.255.255.0 Port: 3260 Controller 1, Port 3: IP: 192.168.133.102 Subnet Mask: 255.255.255.0 Port: 3260 NOTE: No default gateway is set. To configure the iSCSI ports on the storage array: 1 From MDSM navigate to the Setup tab on the AMW. 2 Click configure Ethernet management ports and then select Configure iSCSI Host Ports.

  • Page 63: Step 3: Perform Target Discovery From The Iscsi Initiator

    6 Test the connection by performing a ping command on each iSCSI storage array port. Step 3: Perform Target Discovery From the iSCSI Initiator This step identifies the iSCSI ports on the storage array to the host server. Select the set of steps in one of the following sections (Microsoft Windows or Linux) that corresponds to your operating system.
  • Page 64 /etc/iscsi/iscsid.conf file, which is installed by default when you install MDSM. You can edit the file directly, or replace the default file with a sample file included on the PowerVault MD3600i Series resource media. To use the sample file included on the media: 1 Make a copy of the default /etc/iscsi/iscsid.conf file by saving it to another...

  • Page 65: Step 4: Configure Host Access

    4 Verify that the iSCSI service is running during boot using the following command from the console: chkconfig iscsi 5 To display the available iSCSI targets at the specified IP address, use the following command: iscsiadm –m discovery –t st -p <IP_address_of_iSCSI_port>...

  • Page 66: Understanding Chap Authentication

    Understanding CHAP Authentication What is CHAP? Challenge Handshake Authentication Protocol (CHAP) is an optional iSCSI authentication method where the storage array (target) authenticates iSCSI initiators on the host server. Two types of CHAP are supported: • Target CHAP • Mutual CHAP Target CHAP In target CHAP , the storage array authenticates all requests for access issued by the iSCSI initiator(s) on the host server using a CHAP secret.

  • Page 67: Step 5: Configure Chap Authentication On The Storage Array (Optional)

    Table A-3. CHAP Types Defined CHAP Type Description Target CHAP Sets up accounts that iSCSI initiators use to connect to the target storage array. The target storage array then authenticates the iSCSI initiator. Mutual CHAP Applied in addition to target CHAP , mutual CHAP sets up an account that a target storage array uses to connect to an iSCSI initiator.

  • Page 68: Configuring Mutual Chap Authentication On The Storage Array

    Although the storage array allows sizes from 12 to 57 characters, many initiators only support CHAP secret sizes up to 16 characters (128-bit). NOTE: A CHAP secret is not retrievable after it is entered. Ensure that you record the secret in an accessible place. If Generate Random Secret is used, copy and paste the secret into a text file for future reference since the same CHAP secret is used to authenticate any new host servers you may add to the storage array.

  • Page 69: Step 6: Configure Chap Authentication On The Host Server (Optional)

    NOTE: To remove a CHAP secret, you must delete the host initiator and re-add it. Step 6: Configure CHAP Authentication on the Host Server (Optional) If you configured CHAP authentication in "Step 5: Configure CHAP Authentication on the Storage Array (Optional)" on page 67, complete the following steps.
  • Page 70 • CHAP logon information—Enter the target CHAP authentication user name and secret you entered (for the host server) on the storage array. • Perform mutual authentication—If mutual CHAP authentication is configured, select this option. NOTE: IPSec is not supported. 8 Click OK. If you require a discovery session failover, repeat step 5 and step 6 (in this procedure) for all iSCSI ports on the storage array.
  • Page 71 If you are using Red Hat Enterprise Linux 5, Red Hat Enterprise Linux 6, SUSE Linux Enterprise Server 10, or SUSE Linux Enterprise Server 11: 1 To enable CHAP (optional), the following line needs to be enabled in your /etc/iscsi/iscsid.conf file: node.session.auth.authmethod = CHAP 2 To set a user name and password for CHAP authentication of the initiator by the target(s), edit the following lines:...
  • Page 72 = <CHAP_target_password> 7 The final configuration contained in the /etc/iscsi/iscsid.conf file might look like this: node.session.auth.authmethod = CHAP node.session.auth.username = iqn.2005- 03.com.redhat01.78b1b8cad821 node.session.auth.password password_1 node.session.auth.username_in= iqn.1984- 05.com.dell:powervault.123456 node.session.auth.password_in test1234567890 discovery.sendtargets.auth.authmethod CHAP discovery.sendtargets.auth.username = iqn.2005- 03.com.redhat01.78b1b8cad821 discovery.sendtargets.auth.password password_1 discovery.sendtargets.auth.username = iqn.1984- 05.com.dell:powervault.123456...

  • Page 73: Step 7: Connect To The Target Storage Array From The Host Server

    7 Select one: • If you are not using CHAP authentication, select No Authentication. Go to step 8. • If you are using CHAP authentication, enter the CHAP user name and password. To enable Mutual CHAP, select and enter the Mutual CHAP user name and password.
  • Page 74 • Data Digest and Header Digest—Optionally, you can specify that a digest of data or header information be compiled during transmission to assist in troubleshooting. CHAP logon information—If CHAP authentication is required, • select this option and enter the Target secret. •...
  • Page 75 * * * An asterisk (*) represents the default value of a parameter. For example, your log on command might look like this: iscsicli PersistentLoginTarget iqn.1984- 05.com.dell:powervault.6001372000ffe3332xx0000046 72edf2 3260 T 192.168.130.101 * * * 0x2 * * * * * To view active sessions to the target, run the following command:...

  • Page 76: Step 8: (Optional) Set Up In-Band Management

    PersistentLoginTarget does not initiate a login to the target until after the system is rebooted. To establish immediate login to the target, substitute LoginTarget for PersistentLoginTarget. NOTE: See the Microsoft iSCSI Software Initiator 2.x User’s Guide for more information about the commands used in the previous steps. For more information about Windows Server 2008 Server Core, see the Microsoft Developers Network (MSDN) at microsoft.com.
  • Page 77 NOTE: Configure the management station you are using for network communication to the same IP subnet as the MD36x0i host ports. 1 Establish an iSCSI session to the MD3600i RAID storage array. 2 Restart the SMagent service. 3 Launch MDSM. If this is the first storage array to be set up for management, the Add New Storage Array window appears.
  • Page 78 Appendix—Manual Configuration of iSCSI...

  • Page 79: C Appendix-Load Balancing

    Appendix—Load Balancing Load Balance Policy Multi-path drivers select the I/O path to a virtual disk through a specific RAID controller module. When the multi-path driver receives a new I/O to process, the driver tries to find a path to the current RAID controller module that owns the virtual disk.

  • Page 80: Changing Load Balance Policies On The Windows Server 2008 Operating System

    Least Queue Depth With Subset The least queue depth with subset policy is also known as the least I/Os or least requests policy. This policy routes the next I/O request to a data path that has the least outstanding I/O requests queued. For this policy, an I/O request is simply a command in the queue.

  • Page 81: Load Balance Policy

    Increasing Bandwidth With Multiple iSCSI Sessions The PowerVault MD3600i Series storage array in a duplex configuration supports two active/active asymmetric redundant controllers. Each controller has two 10G Ethernet ports that support iSCSI. The bandwidth of the two ports on the same controller can be aggregated to provide optimal performance.
  • Page 82 Figure C-1. Initiator Configuration IP Addresses Host If1: IP_Addr_If1 host server If2: IP_Addr_If2 MD36x0i Controller 0 P0: IP_Addr_C0_P0 P1: IP_Addr_C0_P1 MD36x0i Controller 1 P0: IP_Addr_C1_P0 P1: IP_Addr_C1_P1 IP network 2 IP network 1 TCP Connections To MD36x0i Controller 0 T01: IP_Addr_If1 / IP_Addr_C0_P0 T02: IP_Addr_If2 / IP_Addr_C1_P1 To MD36x0i Controller 1 T11: IP_Addr_If1 / IP_Addr_C1_P0...

  • Page 83: Increasing Bandwidth With Multiple Iscsi Sessions

    Two sessions with one TCP connection are configured from the host to each controller (one session per port), for a total of two sessions. The multi-path failover driver balances I/O access across the sessions to the ports on the same controller.
  • Page 84 Appendix—Load Balancing...

  • Page 85: Naming Service

    Appendix—Using Internet Storage Naming Service Internet Storage Naming Service (iSNS) server, supported only on Microsoft Windows iSCSI environments, eliminates the need to manually configure each individual storage array with a specific list of initiators and target IP addresses. Instead, iSNS automatically discovers, manages, and configures all iSCSI devices in your environment.
  • Page 86 Appendix—Using Internet Storage Naming Service...

  • Page 87: D Appendix-Stopping Iscsi Services In Linux

    Appendix—Stopping iSCSI Services in Linux Follow the procedure given below to manually stop the iSCSI services in Linux. To shut down iSCSI services: 1 Stop all I/O. 2 Unmount all correlated file systems. Stop iSCSI services by running the following command: /etc/init.d/open-iscsi stop Appendix—Stopping iSCSI Services in Linux...
  • Page 88 Appendix—Stopping iSCSI Services in Linux...

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